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SDI Open Water Set Questions And Answers Latest Top Score.

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SDI Open Water Set Questions And Answers Latest Top Score. What is the absolute pressure (in atm) at 66 feet? - correct answer. 2 atm What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when it's taken to the surface? - correct answer. 8 cubi...

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  • October 2, 2024
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  • 2024/2025
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  • SDI Open Water Set
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SDI Open Water Set Questions And
Answers Latest Top Score.



What is the absolute pressure (in atm) at 66 feet? - correct answer. 2 atm

What will be the volume in a ball that is filled with two cubic feet of air at 99 feet when
it's taken to the surface? - correct answer. 8 cubic feet

How many more times dense is the air in a balloon at 4 atm compared to the air density
at the surface? - correct answer. 4 X as dense

What is the abbreviation for an atmosphere? - correct answer. atm

If a scuba cylindar lasts 2 hours (120 minutes) at sea level, how long will it last at 66
feet? - correct answer. 40 minutes

How often should a diver equalize during a descent? - correct answer. Early and often

What should you do if you experience discomfort in your ears while descending? -
correct answer. Stop descent, ascend a few feet. Equalize, then descend again.

What is a reverse block? - correct answer. Pressure caused by air spaces in your
body expanding during ascent.

What is squeeze? - correct answer. The painful compression of air spaces in your
body or equipment during descent.

, What should you do if you experience a reverse block upon ascending? - correct
answer. Descend a few feet until the pain subsides. Wait a few moments. Then,
ascend again.

What is the most important rule in scuba diving? - correct answer. Never hold your
breath!

What is the most serious injury that a diver can suffer from if they hold their breath while
ascending? - correct answer. Lung over-expansion injury (possibly fatal)

Which gas component in air causes decompression sickness and narcosis? - correct
answer. Nitrogen

What medical problem can occur if a diver ascends much too rapidly for nitrogen to be
slowly released, or off-gassed? - correct answer. Decompression Sickness

List at least 5 factors that can predispose a diver to decompression sickness. - correct
answer. 1. Obesity
2. Age
3. Illness
4. Past/Present Injuries
5. Prior History of DCS
6. Fatigue
7. Dehydration
8. Smoke inhalation
9. Use of drugs/alcohol prior to dive
10. Repetative Dives
11. Overexertion
12. Cold Water
13. Diving at higher altitudes

Describe the symptoms of DCS, including mild to severe signs and symptoms. - correct
answer. 1. Rash or Crackling Skin
2. Joint Pain (most common symptom)
3. Difficulty Breathing
4. Cough
5. Numbness
6. Dizziness
7. Tingling
8. Paralysis
9. Temporary Blindness
10. Unconciousness

What is the depth threshold where most scuba divers begin to be affected by nitrogen
narcosis? - correct answer. 100 feet

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